Adding ascending sort of TrackGroup

[yoobi]

This enhancement match with this issue #7709

This is my first time contributing to a project, feel free to tell me if I did something wrong.

I'm comparing the bitrate of the TrackGroup as it works for both Audio and Video.

I've also notice that the original TrackGroup from trackGroups.get(groupIndex); is always 0, maybe I could delete the first loop over the groupIndex

[google-cla]

Thanks for your pull request. It looks like this may be your first contribution to a Google open source project (if not, look below for help). Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

📝 Please visit https://cla.developers.google.com/ to sign.

Once you've signed (or fixed any issues), please reply here with @googlebot I signed it! and we'll verify it.

---

What to do if you already signed the CLA

Individual signers

• It's possible we don't have your GitHub username or you're using a different email address on your commit. Check your existing CLA data and verify that your email is set on your git commits.

Corporate signers

• Your company has a Point of Contact who decides which employees are authorized to participate. Ask your POC to be added to the group of authorized contributors. If you don't know who your Point of Contact is, direct the Google project maintainer to go/cla#troubleshoot (Public version).
• The email used to register you as an authorized contributor must be the email used for the Git commit. Check your existing CLA data and verify that your email is set on your git commits.
• The email used to register you as an authorized contributor must also be attached to your GitHub account.

ℹ️ Googlers: Go here for more info.

[yoobi]

@googlebot I signed it!

[yoobi]

It seems I've made a mistake, when selecting the format (ie: 250p) it is not switching to it but to another one.

[ojw28]

In terms of making this API generally useful, could you design it so that the caller can pass any Comparator<Format>, rather than just providing a boolean option to enable one specific type of sorting? This would also be useful for other use cases, for example sorting text tracks based on their language.

[yoobi]

You're right, I'll use a Comparator<Format> instead, problem is I don't see where to do the sort.
My previous problem was when I changed the order in TrackSelectionView the array was sorted and then displayed in the UI, but behind when I was clicking on a Format it was using the old array.
Or Should I pass the Comparator to MappedTrackInfo and make the sorting there ?

[yoobi]

I've been doing the sorting (inside MappingTrackSelector) but the issue is once it is all sorted, it no longer goes into onTracksChanged, and I've got no error. Do you have any idea why?

[ojw28]

Obsoleted by #7798